A Swagelok Connections
Making Swagelok Connections
240 Maintaining Your GC
Making Swagelok Connections
Objective
To make a tubing connection that does not leak and that can be taken apart without damaging
the fitting.
Materials needed:
• 1/8-inch (or 1/4-inch, if used) preconditioned copper tubing
• 1/8-inch (or 1/4-inch, if used) Swagelok nuts
• Front and back ferrules
• Two 7/16-inch (for 1/8-inch nuts) or 9/16-inch (for 1/4-inch nuts) wrenches
1 Place a Swagelok nut, back ferrule, and front ferrule to the tubing as shown in Figure 23.
Figure 23. Swagelok nuts and ferrules
2 Clamp a stainless steel plug or similar fitting in a bench vise.
Use a separate stainless steel fitting in a vise for initial tightening of the nut. Do not use an
inlet or detector fitting. Strong forces are required to properly set the ferrules, and damage to
an inlet or detector fitting is very costly to repair.
3 Push the tubing into the stainless steel plug. See Figure 24.
4 Make sure that the front ferrule is touching the plug. Slide the Swagelok nut over the ferrule
and thread it onto the plug.
Figure 24. Assemble the fitting
Front ferrule
Back ferrule
Nut
Tubing
IMPORTANT!
The narrow end of the back
ferrule fits into the rear of
the front ferrule.
Plug or fitting
Nut and ferrules
Tubing
held in a vise
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